Leviton 50240-MSA 120/240 Volt 200 Amp, Secondary Surge Arrestor, Surge Protective Device 4 Jaw Socket Meter Socket Diagnostic LED's: Green indicates surge protection is active, Red indicates protection is no longer active Designed for 120/240 volt single-phase ringless or ring-type meters.Operating temperature: -40C to 60C,Storage temperature: -50C to 85C Rugged housing constructed of high-impact, non-conductive fiberglass-reinforced polycarbonate Available in popular jaw configurations, featuring spring-loaded, high-pressure copper-plated contacts for maximum conductivity Limited Lifetime Product Warranty